Patients with relatively poor immunity or with previous upper gastrointestinal diseases may experience digestive symptoms after eating pork liver, especially when they have eaten too much of it, including nausea, acid reflux, heartburn, vomiting, and vomiting of stomach contents. 2. For patients with previous gastroduodenal ulcers or even esophageal or fundic varices, vomiting of blood or even black stools may occur.